下面列出了android.view.Gravity#START 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。
/**
* 创建窗口对象、添加我们要移动的View
*
* @param dragBitmap
* @param x
* @param y
*/
public void startDrag(Bitmap dragBitmap, int x, int y) {
stopDrag();
// 获取window界面的Params
windowParams = new WindowManager.LayoutParams();
// Gravity.TOP|Gravity.START;这个必须加
windowParams.gravity = Gravity.TOP | Gravity.START;
// 得到要移动的View左上角相对于屏幕的坐标
windowParams.x = x - win_view_x;
windowParams.y = y - win_view_y;
// 设置拖拽item的宽和高
windowParams.width = (int) (dragScale * dragBitmap.getWidth()); // 放大dragScale倍，可以设置拖动后的倍数
windowParams.height = (int) (dragScale * dragBitmap.getHeight()); // 放大dragScale倍，可以设置拖动后的倍数
this.windowParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
| WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE
| WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
| WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN;
this.windowParams.format = PixelFormat.TRANSLUCENT;
this.windowParams.windowAnimations = 0;
ImageView iv = new ImageView(getContext());
iv.setImageBitmap(dragBitmap);
windowManager = (WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE);
windowManager.addView(iv, windowParams);
dragImageView = iv;
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (!mAnimated) {
return;
}
updateColorsForState();
boolean rightAligned = (getGravity() & Gravity.RIGHT) == Gravity.RIGHT || (getGravity() & Gravity.END) == Gravity.END;
boolean leftAligned = (getGravity() & Gravity.LEFT) == Gravity.LEFT || (getGravity() & Gravity.START) == Gravity.START;
if (rightAligned) {
drawGravityRight(canvas);
} else if (leftAligned) {
drawGravityLeft(canvas);
} else {
drawGravityCenterHorizontal(canvas);
}
}
private static Animator createTranslationDisappearAnimator(
View sceneRoot, View view, @GravityFlag int slideEdge, @Px int slideDistance) {
switch (slideEdge) {
case Gravity.LEFT:
return createTranslationXAnimator(view, 0, -slideDistance);
case Gravity.TOP:
return createTranslationYAnimator(view, 0, slideDistance);
case Gravity.RIGHT:
return createTranslationXAnimator(view, 0, slideDistance);
case Gravity.BOTTOM:
return createTranslationYAnimator(view, 0, -slideDistance);
case Gravity.START:
return createTranslationXAnimator(
view, 0, isRtl(sceneRoot) ? -slideDistance : slideDistance);
case Gravity.END:
return createTranslationXAnimator(
view, 0, isRtl(sceneRoot) ? slideDistance : -slideDistance);
default:
throw new IllegalArgumentException("Invalid slide direction: " + slideEdge);
}
}
private static Animator createTranslationAppearAnimator(
View sceneRoot, View view, @GravityFlag int slideEdge, @Px int slideDistance) {
switch (slideEdge) {
case Gravity.LEFT:
return createTranslationXAnimator(view, slideDistance, 0);
case Gravity.TOP:
return createTranslationYAnimator(view, -slideDistance, 0);
case Gravity.RIGHT:
return createTranslationXAnimator(view, -slideDistance, 0);
case Gravity.BOTTOM:
return createTranslationYAnimator(view, slideDistance, 0);
case Gravity.START:
return createTranslationXAnimator(
view, isRtl(sceneRoot) ? slideDistance : -slideDistance, 0);
case Gravity.END:
return createTranslationXAnimator(
view, isRtl(sceneRoot) ? -slideDistance : slideDistance, 0);
default:
throw new IllegalArgumentException("Invalid slide direction: " + slideEdge);
}
}
private void initView(Context context) {
mWindowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
mLayoutParams = new WindowManager.LayoutParams();
mLayoutParams.gravity = Gravity.START | Gravity.TOP;
mLayoutParams.width = ViewGroup.LayoutParams.WRAP_CONTENT;
mLayoutParams.height = ViewGroup.LayoutParams.WRAP_CONTENT;
mLayoutParams.format = PixelFormat.TRANSLUCENT;
mLayoutParams.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL
| WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
| WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N_MR1) {
mLayoutParams.type = WindowManager.LayoutParams.TYPE_APPLICATION;
} else {
mLayoutParams.type = WindowManager.LayoutParams.TYPE_TOAST;
}
}
/**
* Describes how the child views are positioned. Defaults to GRAVITY_TOP. If
* this layout has a VERTICAL orientation, this controls where all the child
* views are placed if there is extra vertical space. If this layout has a
* HORIZONTAL orientation, this controls the alignment of the children.
*
* @param gravity See {@link android.view.Gravity}
*
* @attr ref android.R.styleable#LinearLayout_gravity
*/
@android.view.RemotableViewMethod
public void setGravity(int gravity) {
if (mGravity != gravity) {
if ((gravity & Gravity.RELATIVE_HORIZONTAL_GRAVITY_MASK) == 0) {
gravity |= Gravity.START;
}
if ((gravity & Gravity.VERTICAL_GRAVITY_MASK) == 0) {
gravity |= Gravity.TOP;
}
mGravity = gravity;
requestLayout();
}
}
private void startDragging(Bitmap bm, int x, int y) {
stopDragging();
mWindowParams = new WindowManager.LayoutParams();
mWindowParams.gravity = Gravity.TOP | Gravity.START;
mWindowParams.x = x;
mWindowParams.y = y - mDragPoint + mCoordOffset;
mWindowParams.height = WindowManager.LayoutParams.WRAP_CONTENT;
mWindowParams.width = WindowManager.LayoutParams.WRAP_CONTENT;
mWindowParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
| WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE
| WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
| WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN
| WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS;
mWindowParams.format = PixelFormat.TRANSLUCENT;
mWindowParams.windowAnimations = 0;
Context context = getContext();
ImageView v = new ImageView(context);
int backGroundColor = context.getResources().getColor(R.color.dragndrop_background);
v.setAlpha((float) 0.7);
v.setBackgroundColor(backGroundColor);
v.setImageBitmap(bm);
mDragBitmap = bm;
mWindowManager = (WindowManager) context.getSystemService("window");
mWindowManager.addView(v, mWindowParams);
mDragView = v;
}
/**
* Add a new group that will display a header in this AboutPage
* <p>
* A header will be displayed in the order it was added. For e.g:
* <p>
* <code>
* new AboutPage(this)
* .addItem(firstItem)
* .addGroup("Header")
* .addItem(secondItem)
* .create();
* </code>
* <p>
* Will display the following
* [First item]
* [Header]
* [Second item]
*
* @param name the title for this group
* @return this AboutPage instance for builder pattern support
*/
public AboutPage addGroup(String name) {
TextView textView = new TextView(mContext);
textView.setText(name);
TextViewCompat.setTextAppearance(textView, R.style.about_groupTextAppearance);
LinearLayout.LayoutParams textParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
if (mCustomFont != null) {
textView.setTypeface(mCustomFont);
}
int padding = mContext.getResources().getDimensionPixelSize(R.dimen.about_group_text_padding);
textView.setPadding(padding, padding, padding, padding);
if (mIsRTL) {
textView.setGravity(Gravity.END | Gravity.CENTER_VERTICAL);
textParams.gravity = Gravity.END | Gravity.CENTER_VERTICAL;
} else {
textView.setGravity(Gravity.START | Gravity.CENTER_VERTICAL);
textParams.gravity = Gravity.START | Gravity.CENTER_VERTICAL;
}
textView.setLayoutParams(textParams);
((LinearLayout) mView.findViewById(R.id.about_providers)).addView(textView);
return this;
}
private WindowManager.LayoutParams createPopupLayout(IBinder token) {
WindowManager.LayoutParams p = new WindowManager.LayoutParams();
p.gravity = Gravity.START | Gravity.TOP;
p.width = ViewGroup.LayoutParams.MATCH_PARENT;
p.height = ViewGroup.LayoutParams.MATCH_PARENT;
p.format = PixelFormat.TRANSLUCENT;
p.flags = computeFlags(p.flags);
p.type = WindowManager.LayoutParams.TYPE_APPLICATION_PANEL;
p.token = token;
p.softInputMode = WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN;
return p;
}
/**
* Describes how the selected item view is positioned.
*
* @param gravity See {@link Gravity}
*
* @attr ref android.R.styleable#Spinner_gravity
*/
public void setGravity(int gravity) {
if (mGravity != gravity) {
if ((gravity & Gravity.HORIZONTAL_GRAVITY_MASK) == 0)
gravity |= Gravity.START;
mGravity = gravity;
requestLayout();
}
}
@SuppressLint("RtlHardcoded")
private int getMaxDistance(@NonNull ViewGroup sceneRoot) {
switch (mSide) {
case Gravity.LEFT:
case Gravity.RIGHT:
case Gravity.START:
case Gravity.END:
return sceneRoot.getWidth();
default:
return sceneRoot.getHeight();
}
}
private void updateFloatingMenu() {
if (mConfig.isLeftHandMode()) {
CoordinatorLayout.LayoutParams lp = (CoordinatorLayout.LayoutParams) mFam.getLayoutParams();
lp.gravity = Gravity.START | Gravity.BOTTOM;
mFam.setExpandDirection(FloatingActionsMenu.EXPAND_UP, FloatingActionsMenu.LABELS_ON_RIGHT_SIDE);
mFam.setLayoutParams(lp);
}
}
private PointF calculePopupLocation() {
PointF location = new PointF();
final RectF anchorRect = SimpleTooltipUtils.calculeRectInWindow(mAnchorView);
final PointF anchorCenter = new PointF(anchorRect.centerX(), anchorRect.centerY());
switch (mGravity) {
case Gravity.START:
location.x = anchorRect.left - mPopupWindow.getContentView().getWidth() - mMargin;
location.y = anchorCenter.y - mPopupWindow.getContentView().getHeight() / 2f;
break;
case Gravity.END:
location.x = anchorRect.right + mMargin;
location.y = anchorCenter.y - mPopupWindow.getContentView().getHeight() / 2f;
break;
case Gravity.TOP:
location.x = anchorCenter.x - mPopupWindow.getContentView().getWidth() / 2f;
location.y = anchorRect.top - mPopupWindow.getContentView().getHeight() - mMargin;
break;
case Gravity.BOTTOM:
location.x = anchorCenter.x - mPopupWindow.getContentView().getWidth() / 2f;
location.y = anchorRect.bottom + mMargin;
break;
default:
throw new IllegalArgumentException("Gravity must have be START, END, TOP or BOTTOM.");
}
return location;
}
@Nullable
public View findSnapView(@NonNull RecyclerView.LayoutManager lm, boolean checkEdgeOfList) {
View snapView = null;
switch (gravity) {
case Gravity.START:
snapView = findView(lm, getHorizontalHelper(lm), Gravity.START, checkEdgeOfList);
break;
case Gravity.END:
snapView = findView(lm, getHorizontalHelper(lm), Gravity.END, checkEdgeOfList);
break;
case Gravity.TOP:
snapView = findView(lm, getVerticalHelper(lm), Gravity.START, checkEdgeOfList);
break;
case Gravity.BOTTOM:
snapView = findView(lm, getVerticalHelper(lm), Gravity.END, checkEdgeOfList);
break;
case Gravity.CENTER:
if (lm.canScrollHorizontally()) {
snapView = findView(lm, getHorizontalHelper(lm), Gravity.CENTER,
checkEdgeOfList);
} else {
snapView = findView(lm, getVerticalHelper(lm), Gravity.CENTER,
checkEdgeOfList);
}
break;
}
if (snapView != null) {
nextSnapPosition = recyclerView.getChildAdapterPosition(snapView);
} else {
nextSnapPosition = RecyclerView.NO_POSITION;
}
return snapView;
}
private void addCustomView(Canvas canvas) {
if (mCustomView.size() != 0) {
for (int i = 0; i < mCustomView.size(); i++) {
float cy = mCustomView.get(i).getMeasuredHeight() / 2, cx = mCustomView.get(i).getMeasuredWidth() / 2;
float diffY, diffX;
float marginTop = mCustomViewTopMargins.get(i);
float marginLeft = mCustomViewLeftMargins.get(i);
float marginRight = mCustomViewRightMargins.get(i);
float marginBottom = mCustomViewBottomMargins.get(i);
mTargetViewGlobalRect = new Rect();
mTargetView.getGlobalVisibleRect(mTargetViewGlobalRect);
View view = mCustomView.get(i);
switch (mCustomViewGravity.get(i)) {
case Gravity.START:
case Gravity.LEFT:
diffY = mCenterY - cy;
diffX = mCenterX - cx;
if (diffX < 0) {
view.layout(0, 0, (int) (mCenterX - view.getMeasuredWidth() - 2 * marginRight),
(int) (mCustomView.get(i).getMeasuredHeight() + 2 * (diffY + marginTop)));
} else {
view.layout((int) diffX, 0, (int) (view.getMeasuredWidth() - diffX - 2 * marginRight),
(int) (mCustomView.get(i).getMeasuredHeight() + 2 * (diffY + marginTop)));
}
break;
case Gravity.TOP:
diffY = mCenterY - cy - 2 * mTargetView.getMeasuredHeight();
view.layout((int) (-marginLeft), 0, (int) (view.getMeasuredWidth() + marginLeft),
(int) (mCustomView.get(i).getMeasuredHeight() + 2 * (diffY + marginTop)));
break;
case Gravity.END:
case Gravity.RIGHT:
diffY = mCenterY - cy;
view.layout(-2 * mTargetViewGlobalRect.right, 0,
(int) (view.getMeasuredWidth() + 4 * marginLeft), (int) (mCustomView.get(i).getMeasuredHeight() + 2 * (diffY + marginTop)));
break;
case Gravity.BOTTOM:
diffY = mCenterY - cy + 2 * mTargetView.getMeasuredHeight();
view.layout((int) (-marginLeft), 0, (int) (view.getMeasuredWidth() + marginLeft),
(int) (mCustomView.get(i).getMeasuredHeight() + 2 * (diffY + marginTop)));
break;
default:
mCustomView.get(i).layout(0, 0, mCustomView.get(i).getMeasuredWidth(), mCustomView.get(i).getMeasuredHeight());
}
mCustomView.get(i).draw(canvas);
}
} else {
Log.d(TAG, "No Custom View defined");
}
}
private void findBadgeCenter() {
float rectWidth = mBadgeTextRect.height() > mBadgeTextRect.width() ?
mBadgeTextRect.height() : mBadgeTextRect.width();
switch (mBadgeGravity) {
case Gravity.START | Gravity.TOP:
mBadgeCenter.x = mGravityOffsetX + mBadgePadding + rectWidth / 2f;
mBadgeCenter.y = mGravityOffsetY + mBadgePadding + mBadgeTextRect.height() / 2f;
break;
case Gravity.START | Gravity.BOTTOM:
mBadgeCenter.x = mGravityOffsetX + mBadgePadding + rectWidth / 2f;
mBadgeCenter.y = mHeight - (mGravityOffsetY + mBadgePadding + mBadgeTextRect.height() / 2f);
break;
case Gravity.END | Gravity.TOP:
mBadgeCenter.x = mWidth - (mGravityOffsetX + mBadgePadding + rectWidth / 2f);
mBadgeCenter.y = mGravityOffsetY + mBadgePadding + mBadgeTextRect.height() / 2f;
break;
case Gravity.END | Gravity.BOTTOM:
mBadgeCenter.x = mWidth - (mGravityOffsetX + mBadgePadding + rectWidth / 2f);
mBadgeCenter.y = mHeight - (mGravityOffsetY + mBadgePadding + mBadgeTextRect.height() / 2f);
break;
case Gravity.CENTER:
mBadgeCenter.x = mWidth / 2f;
mBadgeCenter.y = mHeight / 2f;
break;
case Gravity.CENTER | Gravity.TOP:
mBadgeCenter.x = mWidth / 2f;
mBadgeCenter.y = mGravityOffsetY + mBadgePadding + mBadgeTextRect.height() / 2f;
break;
case Gravity.CENTER | Gravity.BOTTOM:
mBadgeCenter.x = mWidth / 2f;
mBadgeCenter.y = mHeight - (mGravityOffsetY + mBadgePadding + mBadgeTextRect.height() / 2f);
break;
case Gravity.CENTER | Gravity.START:
mBadgeCenter.x = mGravityOffsetX + mBadgePadding + rectWidth / 2f;
mBadgeCenter.y = mHeight / 2f;
break;
case Gravity.CENTER | Gravity.END:
mBadgeCenter.x = mWidth - (mGravityOffsetX + mBadgePadding + rectWidth / 2f);
mBadgeCenter.y = mHeight / 2f;
break;
}
initRowBadgeCenter();
}
@Override
public void onCreate() {
super.onCreate();
active = true;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M
&& !Settings.canDrawOverlays(getApplicationContext())) {
// Can not draw overlays: pass
stopSelf();
} else {
dbHelper = new KcaDBHelper(getApplicationContext(), null, KCANOTIFY_DB_VERSION);
deckInfoCalc = new KcaDeckInfo(getApplicationContext(), getBaseContext());
contextWithLocale = getContextWithLocale(getApplicationContext(), getBaseContext());
mInflater = LayoutInflater.from(contextWithLocale);
notificationManager = NotificationManagerCompat.from(getApplicationContext());
mView = mInflater.inflate(R.layout.view_fleet_check, null);
mView.setOnTouchListener(mViewTouchListener);
mView.findViewById(R.id.view_fchk_head).setOnTouchListener(mViewTouchListener);
((TextView) mView.findViewById(R.id.view_fchk_title)).setText(getStringWithLocale(R.string.fleetcheckview_title));
for (int fchk_id: FCHK_BTN_LIST) {
mView.findViewById(fchk_id).setOnTouchListener(mViewTouchListener);
}
for (int fleet_id: FCHK_FLEET_LIST) {
mView.findViewById(fleet_id).setOnTouchListener(mViewTouchListener);
}
mView.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);
popupWidth = mView.getMeasuredWidth();
popupHeight = mView.getMeasuredHeight();
fchk_info = mView.findViewById(R.id.fchk_value);
mParams = new WindowManager.LayoutParams(
WindowManager.LayoutParams.WRAP_CONTENT,
WindowManager.LayoutParams.WRAP_CONTENT,
getWindowLayoutType(),
WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
PixelFormat.TRANSLUCENT);
mParams.gravity = Gravity.TOP | Gravity.START;
Display display = ((WindowManager) getApplicationContext().getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
Point size = new Point();
display.getSize(size);
screenWidth = size.x;
screenHeight = size.y;
Log.e("KCA", "w/h: " + String.valueOf(screenWidth) + " " + String.valueOf(screenHeight));
mParams.x = (screenWidth - popupWidth) / 2;
mParams.y = (screenHeight - popupHeight) / 2;
mManager = (WindowManager) getSystemService(WINDOW_SERVICE);
mManager.addView(mView, mParams);
}
}
private int getGravity(int gravityEnum) {
return (gravityEnum == 0 ? Gravity.START : gravityEnum == 1 ? Gravity.CENTER_HORIZONTAL : Gravity.END)
| Gravity.CENTER_VERTICAL;
}
@Override
public void onCreate() {
super.onCreate();
active = true;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M
&& !Settings.canDrawOverlays(getApplicationContext())) {
// Can not draw overlays: pass
stopSelf();
} else {
broadcaster = LocalBroadcastManager.getInstance(this);
dbHelper = new KcaDBHelper(getApplicationContext(), null, KCANOTIFY_DB_VERSION);
data_receiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
//String s = intent.getStringExtra(KCA_MSG_DATA);
String s = dbHelper.getValue(DB_KEY_BATTLEINFO);
broadcaster.sendBroadcast(new Intent(KCA_MSG_BATTLE_VIEW_REFRESH));
Log.e("KCA", "KCA_MSG_BATTLE_INFO Received: \n".concat(s));
}
};
LocalBroadcastManager.getInstance(this).registerReceiver((data_receiver), new IntentFilter(KCA_MSG_BATTLE_INFO));
LayoutInflater mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
notificationManager = NotificationManagerCompat.from(getApplicationContext());
mView = mInflater.inflate(R.layout.view_map_hp, null);
mView.setOnTouchListener(mViewTouchListener);
((TextView) mView.findViewById(R.id.view_hp_title)).setText(getStringWithLocale(R.string.viewmenu_maphp_title));
mView.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);
popupWidth = mView.getMeasuredWidth();
popupHeight = mView.getMeasuredHeight();
hp_info = (TextView) mView.findViewById(R.id.hp_info);
mParams = new WindowManager.LayoutParams(
WindowManager.LayoutParams.WRAP_CONTENT,
WindowManager.LayoutParams.WRAP_CONTENT,
getWindowLayoutType(),
WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
PixelFormat.TRANSLUCENT);
mParams.gravity = Gravity.TOP | Gravity.START;
Display display = ((WindowManager) getApplicationContext().getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
Point size = new Point();
display.getSize(size);
screenWidth = size.x;
screenHeight = size.y;
Log.e("KCA", "w/h: " + String.valueOf(screenWidth) + " " + String.valueOf(screenHeight));
mParams.x = (screenWidth - popupWidth) / 2;
mParams.y = (screenHeight - popupHeight) / 2;
mManager = (WindowManager) getSystemService(WINDOW_SERVICE);
mManager.addView(mView, mParams);
}
}
/**
* Describes how the child views are positioned. Defaults to
* <code>Gravity.START | Gravity.TOP</code>.
*
* <p>Note that since RelativeLayout considers the positioning of each child
* relative to one another to be significant, setting gravity will affect
* the positioning of all children as a single unit within the parent.
* This happens after children have been relatively positioned.</p>
*
* @param gravity See {@link android.view.Gravity}
*
* @see #setHorizontalGravity(int)
* @see #setVerticalGravity(int)
*
* @attr ref android.R.styleable#RelativeLayout_gravity
*/
@android.view.RemotableViewMethod
public void setGravity(int gravity) {
if (mGravity != gravity) {
if ((gravity & Gravity.RELATIVE_HORIZONTAL_GRAVITY_MASK) == 0) {
gravity |= Gravity.START;
}
if ((gravity & Gravity.VERTICAL_GRAVITY_MASK) == 0) {
gravity |= Gravity.TOP;
}
mGravity = gravity;
requestLayout();
}
}